Lens module

ABSTRACT

A lens module may include a first lens having positive refractive power, a second lens having refractive power, a third lens having positive refractive power, a fourth lens having refractive power, a fifth lens having refractive power, a sixth lens having refractive power, and a seventh lens having negative refractive power. An inflection point may be formed on an image-side surface of the sixth lens. A turning point may be formed on an image-side surface of the seventh lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are disposed in a sequential order from the first lens to the seventh lens.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.17/022,658 filed on Sep. 16, 2020, which is a continuation of U.S.patent application Ser. No. 16/439,209 filed on Jun. 12, 2019, now U.S.Pat. No. 11,143,846 issued on Oct. 12, 2021, which is a continuation ofU.S. patent application Ser. No. 15/211,429 filed on Jul. 15, 2016, nowU.S. Pat. No. 10,365,456 issued on Jul. 30, 2019, which is a divisionalof U.S. patent application Ser. No. 14/264,963 filed on Apr. 29, 2014,now U.S. Pat. No. 10,018,805 issued on Jul. 10, 2018, which claims thebenefit under 35 USC 119(a) of Korean Patent Application Nos.10-2013-0122193 filed on Oct. 14, 2013, and 10-2014-0008211 filed onJan. 23, 2014, in the Korean Intellectual Property Office, the entiredisclosures of which are incorporated herein by reference for allpurposes.

BACKGROUND

The present technology generally relates to a lens module.

Recent mobile communications terminals have been provided with cameramodules to capture images and to make video calls. In addition, as thefunctionality of camera modules provided in mobile communicationsterminals has been gradually increased, cameras for mobilecommunications terminals have gradually been required to have highdegrees of resolution and high levels of performance.

However, since there is a trend for mobile communications terminals tobe miniaturized and lightened, there are limitations on implementingcamera modules having high degrees of resolution and high levels ofperformance.

Recently, lenses provided in camera modules have been formed of plastic,a material lighter than glass, and lens modules have been configuredusing five or more lenses in order to implement high resolution.

However, in the case of lenses formed of plastic, the improvement ofchromatic aberrations and the implementation of relatively brightoptical systems have been problematic, when compared to than lensesformed of glass.

SUMMARY

Some embodiments of the present disclosure may provide a lens moduleallowing for improvements in an aberration improvement effect andallowing for the implementation of high degrees of resolution.

According to some embodiments of the present disclosure, a lens modulemay include: a first lens having positive refractive power; a secondlens having refractive power; a third lens having positive refractivepower; a fourth lens having refractive power; a fifth lens havingrefractive power; a sixth lens having refractive power; and a seventhlens having negative refractive power. At least one inflection point maybe formed on the image-side surface of the sixth lens. At least oneturning point may be formed on an image-side surface of the seventhlens. The first lens, the second lens, the third lens, the fourth lens,the fifth lens, the sixth lens and the seventh lens are disposed in asequential order from the first lens to the seventh lens.

According to some embodiments of the present disclosure, a lens modulemay include: a first lens having positive refractive power; a secondlens having positive refractive power; a third lens having positiverefractive power; a fourth lens having refractive power; a fifth lenshaving refractive power; a sixth lens having refractive power; and aseventh lens having negative refractive power. At least one inflectionpoint may be formed on the image-side surface of the sixth lens. Atleast one turning point may be formed on an image-side surface of theseventh lens.

According to some embodiments of the present disclosure, a lens modulemay include: a first lens having positive refractive power; a secondlens having refractive power; a third lens having negative refractivepower; a fourth lens having positive refractive power; a fifth lenshaving positive refractive power; a sixth lens having refractive power;and a seventh lens having negative refractive power. At least oneinflection point may be formed on the image-side surface of the sixthlens. At least one turning point may be formed on an image-side surfaceof the seventh lens.

Some embodiments of the lens module may satisfy Conditional Expression1:

1.0<f12/f<2.1  [Conditional Expression 1]

where f12 is a synthetic focal length [mm] of the first and second lens,and f is an overall focal length [mm] of the optical system.

Some embodiments of the lens module may satisfy Conditional Expression2:

TTL/f<1.40  [Conditional Expression 2]

where TTL is a distance [mm] from an object-side surface of the firstlens to an image surface, and f is an overall focal length [mm] of theoptical system.

Some embodiments of the lens module may satisfy Conditional Expression3:

BFL/f>2.0  [Conditional Expression 3]

where BFL is a distance [mm] from the image-side surface of the seventhlens to an image surface, and f is an overall focal length [mm] of theoptical system.

Some embodiments of the lens module may satisfy Conditional Expression4:

R1/f>0.35  [Conditional Expression 4]

where R1 is a radius of curvature [mm] of an object-side surface of thefirst lens, and f is an overall focal length [mm] of the optical system.

Some embodiments of the lens module may satisfy Conditional Expression5:

−0.6<(R11−R12)/(R11+R12)<8.0  [Conditional Expression 5]

where R11 is a radius of curvature [mm] of an object-side surface of thesixth lens, and R12 is a radius of curvature [mm] of an image-sidesurface of the sixth lens.

Some embodiments of the lens module may satisfy Conditional Expression6:

−2.0<R13/f<1.0  [Conditional Expression 6]

where R13 is a radius of curvature [mm] of an object-side surface of theseventh lens.

Some embodiments of the lens module may satisfy Conditional Expression7:

−10.0<(R5−R6)/(R5+R6)<14.0  [Conditional Expression 7]

where R5 is a radius of curvature [mm] of an object-side surface of thethird lens, and R6 is a radius of curvature [mm] of an image-sidesurface of the third lens.

Some embodiments of the lens module may satisfy Conditional Expression8:

ANG/f>15.0  [Conditional Expression 8]

where ANG is an angle of view of the lens module, and f is an overallfocal length [mm] of an optical system including the first to seventhlenses.

The some embodiments of the lens module may satisfy ConditionalExpression 9:

|f1|<|f3|  [Conditional Expression 9]

where f1 is a focal length [mm] of the first lens, and f3 is a focallength [mm] of the third lens.

BRIEF DESCRIPTION OF DRAWINGS

Exemplary embodiments of the present disclosure will be more clearlyunderstood from the following detailed description taken in conjunctionwith the accompanying drawings, in which:

FIG. 1 is a configuration diagram of a lens module according to a firstexemplary embodiment of the present disclosure;

FIG. 2 is a graph showing a modulation transfer function (MTF) of thelens module shown in FIG. 1 ;

FIG. 3 is graphs showing aberration characteristics of the lens moduleshown in FIG. 1 ;

FIG. 4 is a configuration diagram of a lens module according to a secondexemplary embodiment of the present disclosure;

FIG. 5 is a graph showing a MTF of the lens module shown in FIG. 4 ;

FIG. 6 is graphs showing aberration characteristics of the lens moduleshown in FIG. 4 ;

FIG. 7 is a configuration diagram of a lens module according to a thirdexemplary embodiment of the present disclosure;

FIG. 8 is a graph showing a MTF of the lens module shown in FIG. 7 ;

FIG. 9 is graphs showing aberration characteristics of the lens moduleshown in FIG. 7 ;

FIG. 10 is a configuration diagram of a lens module according to afourth exemplary embodiment of the present disclosure;

FIG. 11 is a graph showing a MTF of the lens module shown in FIG. 10 ;

FIG. 12 is graphs showing aberration characteristics of the lens moduleshown in FIG. 10 ;

FIG. 13 is a configuration diagram of a lens module according to a fifthexemplary embodiment of the present disclosure;

FIG. 14 is a graph showing a MTF of the lens module shown in FIG. 13 ;

FIG. 15 is graphs showing aberration characteristics of the lens moduleshown in FIG. 13 ;

FIG. 16 is a configuration diagram of a lens module according to a sixthexemplary embodiment of the present disclosure;

FIG. 17 is a graph showing a MTF of the lens module shown in FIG. 16 ;

FIG. 18 is graphs showing aberration characteristics of the lens moduleshown in FIG. 16 ;

FIG. 19 is a configuration diagram of a lens module according to aseventh exemplary embodiment of the present disclosure;

FIG. 20 is a graph showing a MTF of the lens module shown in FIG. 19 ;and

FIG. 21 is graphs showing aberration characteristics of the lens moduleshown in FIG. 19 .

DETAILED DESCRIPTION

Exemplary embodiments of the present disclosure will be described indetail with reference to the accompanying drawings. The invention may,however, be embodied in many different forms and should not be construedas being limited to the embodiments set forth herein. Rather, theseembodiments are provided to explain the principles of the invention andits practical applications, thereby enabling others skilled in the artto understand the invention for various embodiments and with variousmodifications as are suited to the particular use contemplated. In thedrawings, the shapes and dimensions of elements may be exaggerated forclarity, and the same reference numerals will be used throughout todesignate the same or like elements. It will also be understood that,although the terms first, second, etc. may be used herein to describevarious elements, these elements should not be limited by these terms.These terms are only used to distinguish one element from another. Asused in this description and the appended claims, the singular forms“a”, “an” and “the” are intended to include the plural forms as well,unless the context clearly indicates otherwise.

In the present exemplary embodiments, a first lens refers to a lens thatis the closest to an object side and a seventh lens refers to a lensthat is the closest to an image side. Further, the term ‘front’ refersto a direction from the lens module toward an object side, while theterm ‘rear’ refers to a direction from the lens module toward an imagesensor or the image side. In addition, a first surface of each lensrefers to a surface close to the object side (or an object-side surface)and a second surface of each lens refers to a surface close to the imageside (or an image-side surface). Further, unless particularly described,in the present exemplary embodiments, units of all of radii ofcurvature, thicknesses, TTLs, BFLs, and focal lengths (e.g., f, f1, f2,f3, f4, f5, f6, f7, and f12) of the lenses may be mm. In addition, thethickness of the lens, intervals between the lenses, the TTL (or OAL),SL, and BFL are distance measured on an optical axis of the lens.Further, in a description for a shape of the lens, the meaning that onesurface of the lens is convex is that an optical axis portion of acorresponding surface is convex, and the meaning that one surface of thelens is concave is that an optical axis portion of a correspondingportion is concave. Therefore, although it is described that one surfaceof the lens is convex, an periphery portion of the lens may be concave.Likewise, although it is described that one surface of the lens isconcave, an periphery portion of the lens may be convex. In addition, inthe following detailed description, the term “inflection point” refersto a point at which a radius of curvature is changed in a portion thatdoes not cross the optical axis. Further, in the following detaileddescription, the term “turning point” refers to a convex or concavepoint in a portion that does not cross the optical axis.

FIG. 1 is a configuration diagram of a lens module according to a firstexemplary embodiment of the present disclosure, FIG. 2 is a graphshowing a modulation transfer function (MTF) of the lens module shown inFIG. 1 , FIG. 3 is graphs showing aberration characteristics of the lensmodule shown in FIG. 1 , FIG. 4 is a configuration diagram of a lensmodule according to a second exemplary embodiment of the presentdisclosure, FIG. 5 is a graph showing a MTF of the lens module shown inFIG. 4 , FIG. 6 is graphs showing aberration characteristics of the lensmodule shown in FIG. 4 , FIG. 7 is a configuration diagram of a lensmodule according to a third exemplary embodiment of the presentdisclosure, FIG. 8 is a graph showing a MTF of the lens module shown inFIG. 7 , FIG. 9 is graphs showing aberration characteristics of the lensmodule shown in FIG. 7 , FIG. 10 is a configuration diagram of a lensmodule according to a fourth exemplary embodiment of the presentdisclosure, FIG. 11 is a graph showing a MTF of the lens module shown inFIG. 10 , FIG. 12 is graphs showing aberration characteristics of thelens module shown in FIG. 10 , FIG. 13 is a configuration diagram of alens module according to a fifth exemplary embodiment of the presentdisclosure, FIG. 14 is a graph showing a MTF of the lens module shown inFIG. 13 , FIG. 15 is graphs showing aberration characteristics of thelens module shown in FIG. 13 , FIG. 16 is a configuration diagram of alens module according to a sixth exemplary embodiment of the presentdisclosure, FIG. 17 is a graph showing a MTF of the lens module shown inFIG. 16 , FIG. 18 is graphs showing aberration characteristics of thelens module shown in FIG. 16 , FIG. 19 is a configuration diagram of alens module according to a seventh exemplary embodiment of the presentdisclosure, FIG. 20 is a graph showing a MTF of the lens module shown inFIG. 19 , and FIG. 21 is graphs showing aberration characteristics ofthe lens module shown in FIG. 19 .

A lens module according to the present disclosure may include an opticalsystem including seven lenses. The lens module may include a first lens,a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens,and a seventh lens. The lens module may further include other componentsor additional one or more lenses if necessary. For example, the lensmodule may include a stop for controlling an amount of light. Inaddition, the lens module may further include an infrared cut-off filterfor cutting off an infrared ray. Further, the lens module may include animage sensor (that is, an imaging device) converting an image of asubject incident through the optical system into an electrical signal ordata. The lens module may further include an interval maintaining memberadjusting an interval between lenses. In addition to seven lenses, oneor more lenses may be arranged in front of the first lens, behind theseventh lens, or between the first and seventh lenses.

At least one of the first to seventh lenses may be formed of plastic.For example, the first and seventh lenses may be formed of plastic, andthe other lenses may be formed of a different material. However,materials of the first to seventh lenses are not limited to theabove-mentioned materials. For example, all of the first to seventhlenses may be formed of plastic.

At least one of the object-side surface and image-side surface of atleast one of the first to seventh lenses may be aspheric. For example,the object-side surfaces or image-side surfaces of the first to seventhlenses may be aspheric. As another example, the both of the surfaces(the object-side surfaces and image-side surfaces) of the first toseventh lenses may be aspheric. The aspheric surface of each of thelenses may be represented by Equation 1.

$\begin{matrix}{Z = {\frac{{cY}^{2}}{1 + \sqrt{1 - {\left( {1 + K} \right)c^{2}Y^{2}}}} + {AY}^{4} + {BY}^{6} + {CY}^{8} + {DY}^{10} + {EY}^{12} + {FY}^{14} + \ldots}} & \left\lbrack {{Equation}1} \right\rbrack\end{matrix}$

In Equation 1, Z indicates the height of a point on the aspheric surfaceat a distance Y from the optical axis relative to the tangential planeat the aspheric surface vertex, c indicates curvature (1/r), k indicatesa conic constant, and Y indicates a distance from the point on the curveof the aspheric surface to the optical axis. Constants A to Jsequentially indicate 4th-order to 20th-order aspheric coefficients.

In the lens module according to an exemplary embodiment of the presentdisclosure, the optical system including the first to seventh lenses maysatisfy Conditional Expression 1:

1.0<f12/f<2.1  [Conditional Expression 1]

Here, f12 is a synthetic focal length [mm] of the first and secondlenses, and f is an overall focal length [mm] of the optical system.

Here, Conditional Expression 1 may be a numerical range for optimizingrefractive power of the first and second lenses. For example, in thecase in which the value of f12/f is below the lower limit value ofConditional Expression 1, refractive power may become large, such thatit may be difficult to correct spherical aberration. On the contrary, inthe case in which the value of f12/f is greater than the upper limitvalue of the Conditional Expression 1, the lens module may beadvantageous for correcting aberration, but it may be difficult tominiaturize the optical system.

In the lens module according to an exemplary embodiment of the presentdisclosure, the optical system including the first to seventh lenses maysatisfy Conditional Expression 2:

TTL/f<1.40  [Conditional Expression 2]

Here, TTL is a distance [mm] from an object-side surface of the firstlens to an image surface, and f is the overall focal length [mm] of theoptical system.

Conditional Expression 2 may be a numerical range for miniaturizing thelens module. For example, in the case in which the value of TTL/f isgreater than the upper limit value of Conditional Expression 2, it maybe difficult to miniaturize the lens module.

In the lens module according to an exemplary embodiment of the presentdisclosure, the optical system including the first to seventh lenses maysatisfy Conditional Expression 3:

BFL/f>2.0  [Conditional Expression 3]

Here, BFL is a distance [mm] from an image-side surface of the seventhlens to the image surface, and f is the overall focal length [mm] of theoptical system.

Conditional Expression 3 may be a numerical range for optimizing themanufacturing convenience of the lens module. For example, in the casein which the value of BFL/f is below the lower limit value ofConditional Expression 3, a distance between the seventh lens and theimage surface may not be secured and it may be difficult to actuallymanufacture the lens module.

In the lens module according to an exemplary embodiment of the presentdisclosure, an optical system including the first to seventh lenses maysatisfy Conditional Expression 4:

R1/f>0.35  [Conditional Expression 4]

Here, R1 is a radius of curvature [mm] of the object-side surface of thefirst lens, and f is the overall focal length [mm] of the opticalsystem.

Conditional Expression 4 may be a numerical range for optimizing a shapeof the first lens. For example, in the case in which the value of R1/fis below the lower limit value of Conditional Expression 4, the radiusof curvature may be excessively small, the first lens may be sensitiveto a manufacturing tolerance, and it may be not easy to manufacture thefirst lens.

In the lens module according to an exemplary embodiment of the presentdisclosure, an optical system including the first to seventh lenses maysatisfy Conditional Expression 5:

−0.6<(R11−R12)/(R11+R12)<8.0  [Conditional Expression 5]

Here, R11 is a radius of curvature [mm] of the object-side surface ofthe sixth lens, and R12 is a radius of curvature [mm] of the image-sidesurface of the sixth lens.

Conditional Expression 5 may be a numerical range for optimizing a shapeof the sixth lens. For example, in the case in which the value of(R11−R12)/(R11+R12) goes out of the numerical range of ConditionalExpression 5, a deviation between the radii of curvature of theobject-side surface and the image-side surface of the sixth lens may belarge, and the sixth lens may be disadvantageous for correctingaberration.

In the lens module according to an exemplary embodiment of the presentdisclosure, the optical system including the first to seventh lenses maysatisfy Conditional Expression 6:

−2.0<R13/f<1.0  [Conditional Expression 6]

Here, R13 is a radius of curvature [mm] of the object-side surface ofthe seventh lens.

Conditional Expression 6 may be a numerical range for optimizing a shapeof the seventh lens. For example, in the case in which the value ofR13/f goes out of the numerical range of Conditional Expression 6, itmay be difficult to manufacture the seventh lens, and an effect ofcorrecting aberration may be reduced.

In the lens module according to an exemplary embodiment of the presentdisclosure, the optical system including the first to seventh lenses maysatisfy Conditional Expression 7:

−10.0<(R5−R6)/(R5+R6)<14.0  [Conditional Expression 7]

Here, R5 is a radius of curvature [mm] of the object-side surface of thethird lens, and R6 is a radius of curvature [mm] of the image-sidesurface of the third lens.

For example, in the case in which the value of (R5−R6)/(R5+R6) goes outof the numerical range of Conditional Expression 7, a deviation betweenthe radii of curvature of the object-side surface and the image-sidesurface of the third lens may be large, and the third lens may bedisadvantageous for correcting aberration.

In the lens module according to an exemplary embodiment of the presentdisclosure, the optical system including the first to seventh lenses maysatisfy Conditional Expression 8:

ANG/f>15.0  [Conditional Expression 8]

Here, ANG is an angle of view of the lens module, and f is the overallfocal length [mm] of the optical system including the first to seventhlenses.

For example, in the case in which the value of ANG/f is below the lowerlimit value of Conditional Expression 8, the lens module may bedisadvantageous for providing a wide angle of view.

In the lens module according to an exemplary embodiment of the presentdisclosure, an optical system including the first to seventh lenses maysatisfy Conditional Expression 9:

|f1|<|f3|  [Conditional Expression 9]

Here, f1 is the focal length [mm] of the first lens, and f3 is the focallength [mm] of the third lens.

Hereinafter, the first to seventh lenses of the lens module according toan exemplary embodiment of the present disclosure will be described.

The first lens may have refractive power. For example, the refractivepower of the first lens may be positive. The first lens may be formed ofplastic. However, the material of the first lens is not limited toplastic. For example, different materials which may transmit light maybe used to make the first lens. A first surface of the first lens may beconvex, and a second surface thereof may be concave. For example, thefirst lens may have a meniscus shape in which it is convex toward theobject side or a plano-convex shape in which one surface is convex.However, the shape of the first lens is not limited to theabove-mentioned shape. For example, the second surface of the first lensmay be convex if necessary. At least one of the first and secondsurfaces of the first lens may be aspheric. For example, the first orsecond surface of the first lens or both surfaces thereof may beaspheric.

The second lens may have refractive power. For example, the refractivepower of the second lens may be positive or negative. The second lensmay be formed of plastic. However, the material of the second lens isnot limited to plastic. For example, different materials which maytransmit light may be used to make the second lens. A first surface ofthe second lens may be convex, and a second surface thereof may beconcave. For example, the second lens may have a meniscus shape in whichit is convex toward the object side. However, the shape of the secondlens is not limited to the above-mentioned shape. For example, the firstsurface of the second lens may be concave if necessary. At least one ofthe first and second surfaces of the second lens may be aspheric. Forexample, the first or second surface of the second lens or both surfacesthereof may be aspheric.

The third lens may have refractive power. For example, the refractivepower of the third lens may be positive or negative. The third lens maybe formed of plastic. However, the material of the third lens is notlimited to plastic. For example, different materials which may transmitlight may be used to make the third lens. Both surfaces of the thirdlens may be convex. However, the shape of the third lens is not limitedto the above-mentioned shape. For example, the third lens may have ashape in which an optical axis portion of the object-side surfacethereof is convex, and the peripheral portion of the object-side surfacethereof is concave. In addition, a second surface of the third lens maybe concave. At least one of the first and second surfaces of the thirdlens may be aspheric. For example, the first or second surface of thethird lens or both surfaces thereof may be aspheric.

The fourth lens may have refractive power. For example, the refractivepower of the fourth lens may be positive or negative. The fourth lensmay be formed of plastic. However, the material of the fourth lens isnot limited to the plastic. For example, different materials which maytransmit light may be used to make the fourth lens. A first surface ofthe fourth lens may be concave, and a second surface thereof may beconvex. For example, the fourth lens may have a meniscus shape in whichit is convex toward the image side. However, the shape of the fourthlens is not limited to the above-mentioned shape. The fourth lens mayhave different shapes, for instance, that the first surface of thefourth lens is concave, and the second surface thereof is convex. Atleast one of the first and second surfaces of the fourth lens may beaspheric. For example, the first or second surface of the fourth lens orboth surfaces thereof may be aspheric.

The fifth lens may have refractive power. For example, the refractivepower of the fifth lens may be positive or negative. The fifth lens maybe formed of plastic. However, the material of the fifth lens is notlimited to plastic. For example, different materials which may transmitlight may be used to make the fifth lens. A first surface of the fifthlens may be concave, and a second surface thereof may be convex. Forexample, the fifth lens may have a meniscus shape in which it is convextoward the image side. At least one of the first and second surfaces ofthe fifth lens may be aspheric. For example, the first or second surfaceof the fifth lens or both surfaces thereof may be aspheric.

The sixth lens may have refractive power. For example, the refractivepower of the sixth lens may be positive or negative. The sixth lens maybe formed of plastic. However, the material of the sixth lens is notlimited to plastic. For example, different materials which may transmitlight may be used to make the sixth lens. A first surface of the sixthlens may be convex and a second surface thereof may be concave. However,the shape of the sixth lens is not limited to the above-mentioned shape.The sixth lens may have various shapes, for instance, that the firstsurface thereof is concave, and the second surface thereof is convex. Inaddition, the sixth lens may have a shape in which an inflection pointis formed on at least one of the first and second surfaces thereof. Forexample, the second surface of the sixth lens may be concave at thecenter of an optical axis and become convex toward an edge thereof. Atleast one of the first and second surfaces of the sixth lens or bothsurfaces thereof may be aspheric.

The seventh lens may have refractive power. For example, the refractivepower of the seventh lens may be negative. The seventh lens may beformed of plastic. However, the material of the seventh lens is notlimited to plastic. For example, different materials which may transmitlight may be used to make the seventh lens. A first surface of theseventh lens may be convex, and a second surface thereof may be concave.However, the shape of the seventh lens is not limited to theabove-mentioned shape. The seventh lens may have various shapes, forinstance, in which both surfaces thereof are concave. The seventh lensmay have a shape in which an inflection point is formed on at least oneof the first and second surfaces thereof. For example, the secondsurface of the seventh lens may be concave at the center of an opticalaxis and become convex toward an edge thereof. At least one of the firstand second surfaces of the seventh lens or both surfaces thereof may beaspheric.

Some embodiments of the lens module configured as described above maydecrease aberration which causes image quality deterioration. Further,some embodiments of the lens module configured as described above mayimprove lightness and reduce a manufacturing cost.

Hereinafter, lens modules according to the first to seventh exemplaryembodiments of the present disclosure will be described.

Firstly, the lens module according to the first exemplary embodiment(Example 1) of the present disclosure will be described with referenceto FIGS. 1 through 3 .

The lens module 100 according to this exemplary embodiment may include afirst lens 10, a second lens 20, a third lens 30, a fourth lens 40, afifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module100 may further include an infrared cut-off filter 80 and an imagesensor 90. Additionally, the lens module 100 may include at least oneaperture stop (not shown). The aperture stop (not shown) may be arrangedin front of the first lens 10 or anywhere between the first lens 10 andthe seventh lens 70. For reference, an overall focal length f of thelens module 100 may be 4.543 [mm], a focal length of the first lens 10may be 4.199, a focal length of the second lens 20 may be −9.17, a focallength of the third lens 30 may be 4.903, a focal length of the fourthlens 40 may be −6.400, a focal length of the fifth lens 50 may be−124.921, a focal length of the sixth lens 60 may be 27.141, and a focallength of the seventh lens 70 may be −14.863.

Table 1 below shows radii of curvature of the lenses, thicknesses of thelenses or distances between the lenses, refractive indices of thelenses, and abbe numbers of the lenses. More specifically, values in ahorizontal row corresponding to S1 in a vertical column sequentiallyindicate a radius R1 of curvature of a first surface of the first lens10, a thickness of the first lens 10, a refractive index of the firstlens 10, and an abbe number of first lens 10. In addition, values in ahorizontal row corresponding to S2 in a vertical column sequentiallyindicate a radius R2 of curvature of a second surface of the first lens10 and a distance between the first lens 10 and the second lens 20.Similarly, values in a horizontal row corresponding to S3 in a verticalcolumn sequentially indicate a radius R3 of curvature of a first surfaceof the second lens 20, a thickness of the second lens 20, a refractiveindex of the second lens 20, and an abbe number of second lens 20. Inaddition, values in a horizontal row corresponding to S4 in a verticalcolumn sequentially indicate a radius R4 of curvature of a secondsurface of the second lens 20 and a distance between the second lens 20and the third lens 30. For reference, radii R5 to R14 of curvature ofthe third to seventh lenses, thickness of the third to seventh lenses ordistances between the third to seventh lenses, refractive indices of thelenses, and abbe numbers of the third to seventh lenses are shown in thesame scheme as described above.

Table 2 below indicates an aspheric constant of each of the lenses. Indetail, the first horizontal axis in Table 2 indicates first and secondsurfaces of each of the lenses. For example, number 2 in the firsthorizontal row indicates the first surface of the first lens 10 andnumber 3 in the first horizontal axis indicates the second surface ofthe first lens 10. In addition, number 4 in the first horizontal rowindicates the first surface of the second lens 20 and number 5 in thefirst horizontal axis indicates the second surface of the second lens20. Similarly, numbers 6 to 15 in the first horizontal axis indicatefirst and second surfaces of the third to seventh lenses, respectively.

In this exemplary embodiment, the first lens 10 may have positiverefractive power. The first surface of the first lens 10 may be convex,and the second surface thereof may be concave. The second lens 20 mayhave negative refractive power. The first surface of the second lens 20may be convex, and the second surface thereof may be concave. The thirdlens 30 may have positive refractive power. Both surfaces of the thirdlens 30 may be convex. The fourth lens 40 may have negative refractivepower. The first surface of the fourth lens 40 may be concave, and thesecond surface thereof may be convex. That is, the fourth lens 40 mayhave a meniscus shape in which it is convex toward an image side. Thefifth lens 50 may have negative refractive power. The first surface ofthe fifth lens 50 may be concave, and the second surface thereof may beconvex. That is, the fifth lens 50 may have a meniscus shape in which itis convex toward the image side. The sixth lens 60 may have positiverefractive power. In addition, the first surface of the sixth lens 60may be convex, and the second surface thereof may be concave. The sixthlens 60 may have inflection points formed on the first and secondsurfaces thereof, respectively. The seventh lens 70 may have negativerefractive power. The first surface of the seventh lens 70 may beconvex, and the second surface thereof may be concave. Further, theseventh lens 70 may have an inflection point formed on the secondsurface thereof.

The exemplary embodiment of the lens module configured as describedabove may have MTF characteristics and aberration characteristics asshown in FIGS. 2 and 3 , respectively.

TABLE 1 Radius of Tickness/ Refractive Abbe Example 1 Curvature DistanceIndex number Object Infinity Infinity ST Infinity 0.050 1 1.8598 0.5181.544 56.1 2 9.0224 0.105 3 3.9767 0.220 1.635 24.0 4 2.3118 0.327 56.3324 0.470 1.544 56.1 6 −4.4884 0.341 7 −1.2726 0.220 1.635 24.0 8−1.9772 0.162 9 −1.5843 0.220 1.544 56.1 10 −1.7015 0.100 11 2.66090.519 1.635 24.0 12 2.9085 0.371 13 2.34792 0.641 1.544 56.1 14 1.644650.438 15 Infinity 0.300 1.517 64.2 16 Infinity 0.503 Image

TABLE 2 Example 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Y Radius 1.860 9.0223.977 2.312 6.332 −4.488 −1.273 −1.977 −1.584 −1.702 2.661 2.909 2.3481.645 Conic Constant 0.000 0.000 0.000 −8.131 0.000 0.000 −1.897 −0.4980.055 −0.432 0.000 0.000 −14.574 −7.680 (K) 4th-order −0.015 −0.140−0.256 −0.120 −0.090 −0.055 −0.026 −0.026 0.058 0.038 −0.088 −0.098−0.144 −0.086 Coefficient (A) 6th-order 0.003 0.238 0.528 0.332 0.010−0.012 0.023 0.030 0.011 0.016 −0.010 0.016 0.023 0.022 Coefficient (B)8th-order −0.065 −0.381 −0.639 −0.347 −0.022 0.014 −0.017 −0.011 0.0020.003 0.015 −0.004 0.007 −0.003 Coefficient (C) 10th-order 0.073 0.2890.477 0.222 0.022 −0.018 0.011 −0.002 0.002 −0.004 −0.009 0.000 −0.0030.000 Coefficient (D) 12th-order −0.067 −0.116 −0.168 −0.047 −0.0200.024 −0.001 0.003 0.001 0.001 0.002 0.000 0.000 0.000 Coefficient (E)14th-order 0.013 0.015 0.019 0.000 0.019 −0.010 −0.002 0.001 0.000 0.0000.000 0.000 0.000 0.000 Coefficient (F) 16th-order Coefficient (G)18th-order Coefficient (H) 20th-order Coefficient (J)

The lens module according to the second exemplary embodiment (Example 2)of the present disclosure will be described with reference to FIGS. 4through 6 .

The lens module 100 according to this exemplary embodiment may include afirst lens 10, a second lens 20, a third lens 30, a fourth lens 40, afifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module100 may further include an infrared cut-off filter 80 and an imagesensor 90. Further, the lens module 100 may include at least oneaperture stop (not shown). The aperture stop (not shown) may be arrangedin front of the first lens 10 or anywhere between the first lens 10 andthe seventh lens 70. For reference, an overall focal length f of thelens module 100 may be 4.462 [mm], a focal length of the first lens 10may be 3.742, a focal length of the second lens 20 may be −7.998, afocal length of the third lens 30 may be 5.553, a focal length of thefourth lens 40 may be −8.276, a focal length of the fifth lens 50 may be104.962, a focal length of the sixth lens 60 may be 517.567, and a focallength of the seventh lens 70 may be −12.343.

Table 3 below shows radii of curvature of the lenses, thicknesses of thelenses or distances between the lenses, refractive indices of thelenses, and abbe numbers of the lenses. Table 4 below indicates anaspheric constant of each surface of the lenses.

In this exemplary embodiment, the first lens 10 may have positiverefractive power. A first surface of the first lens 10 may be convex,and a second surface thereof may be concave. The second lens 20 may havenegative refractive power. A first surface of the second lens 20 may beconvex, and a second surface thereof may be concave. The third lens 30may have positive refractive power. Both surfaces of the third lens 30may be convex. The fourth lens 40 may have negative refractive power. Afirst surface of the fourth lens 40 may be concave, and a second surfacethereof may be convex. That is, the fourth lens 40 may have a meniscusshape in which it is convex toward an image side. The fifth lens 50 mayhave positive refractive power. A first surface of the fifth lens 50 maybe concave, and a second surface thereof may be convex. That is, thefifth lens 50 may have a meniscus shape in which it is convex toward theimage side. The sixth lens 60 may have positive refractive power. Afirst surface of the sixth lens 60 may be convex, and a second surfacethereof may be concave. In addition, the sixth lens 60 may haveinflection points formed on the first and second surfaces thereof,respectively. The seventh lens 70 may have negative refractive power. Afirst surface of the seventh lens 70 may be convex, and a second surfacethereof may be concave. Further, the seventh lens 70 may have aninflection point formed on the second surface thereof.

The exemplary embodiment of the lens module configured as describedabove may have MTF characteristics and aberration characteristics asshown in FIGS. 5 and 6 , respectively.

TABLE 3 Radius of Tickness/ Refractive Abbe Example 2 Curvature DistanceIndex number Object Infinity Infinity ST Infinity 0.050 1 1.823 0.5921.544 56.1 2 15.421 0.100 3 4.172 0.220 1.635 24.0 4 2.244 0.375 5 7.1620.467 1.544 56.1 6 −5.106 0.336 7 −1.312 0.240 1.635 24.0 8 −1.872 0.1589 −1.566 0.242 1.544 56.1 10 −1.607 0.100 11 2.899 0.497 1.635 24.0 122.731 0.290 13 3.143 0.724 1.544 56.1 14 1.967 0.265 15 Infinity 0.3001.517 64.2 16 Infinity 0.501 Image

TABLE 4 Example 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Y Radius 1.823 15.4214.172 2.244 7.162 −5.106 −1.312 −1.872 −1.566 −1.607 2.899 2.731 3.1431.967 Conic Constant 0.000 0.000 0.000 −7.071 0.000 0.000 −1.313 −0.5140.046 −0.462 0.000 0.000 −22.646 −8.489 (K) 4th-order −0.010 −0.127−0.256 −0.124 −0.099 −0.081 −0.031 −0.030 0.049 0.039 −0.076 −0.101−0.135 −0.081 Coefficient (A) 6th-order 0.007 0.240 0.525 0.329 0.007−0.011 0.025 0.027 0.008 0.015 −0.012 0.015 0.024 0.023 Coefficient (B)8th-order −0.062 −0.370 −0.640 −0.347 −0.024 0.013 −0.018 −0.010 0.0000.002 0.014 −0.004 0.007 −0.004 Coefficient (C) 10th-order 0.079 0.2820.477 0.221 0.021 −0.019 0.011 −0.002 0.002 −0.004 −0.010 0.000 −0.0030.000 Coefficient (D) 12th-order −0.066 −0.116 −0.170 −0.043 −0.0200.024 −0.001 0.003 0.002 0.001 0.002 0.000 0.000 0.000 Coefficient (E)14th-order 0.014 0.017 0.021 0.000 0.021 −0.009 −0.001 0.001 0.000 0.0000.000 0.000 0.000 0.000 Coefficient (F) 16th-order Coefficient (G)18th-order Coefficient (H) 20th-order Coefficient (J)

The lens module according to the third exemplary embodiment (Example 3)of the present disclosure will be described with reference to FIGS. 7through 9 .

The lens module 100 according to this exemplary embodiment may include afirst lens 10, a second lens 20, a third lens 30, a fourth lens 40, afifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module100 may further include an infrared cut-off filter 80 and an imagesensor 90. Further, the lens module 100 may include at least oneaperture stop (not shown). The aperture stop (not shown) may be arrangedin front of the first lens 10 or anywhere between the first lens 10 andthe seventh lens 70. For reference, an overall focal length f of thelens module 100 may be 4.271 [mm], a focal length of the first lens 10may be 3.782, a focal length of the second lens 20 may be −7.960, afocal length of the third lens 30 may be 5.239, a focal length of thefourth lens 40 may be −6.790, a focal length of the fifth lens 50 may be53.775, a focal length of the sixth lens 60 may be 72.888, and a focallength of the seventh lens 70 may be −15.543.

Table 5 below shows radii of curvature of the lenses, thicknesses of thelenses or distances between the lenses, refractive indices of thelenses, and abbe numbers of the lenses. Table 6 below indicates anaspheric constant of each surface of the lenses.

In this exemplary embodiment, the first lens 10 may have positiverefractive power. A first surface of the first lens 10 may be convex,and a second surface thereof may be concave. The second lens 20 may havenegative refractive power. A first surface of the second lens 20 may beconvex, and a second surface thereof may be concave. The third lens 30may have positive refractive power. Both surfaces of the third lens 30may be convex. The fourth lens 40 may have negative refractive power. Afirst surface of the fourth lens 40 may be concave, and a second surfacethereof may be convex. That is, the fourth lens 40 may have a meniscusshape in which it is convex toward an image side. The fifth lens 50 mayhave positive refractive power. A first surface of the fifth lens 50 maybe concave, and a second surface thereof may be convex. That is, thefifth lens 50 may have a meniscus shape in which it is convex toward theimage side. The sixth lens 60 may have positive refractive power. Afirst surface of the sixth lens 60 may be convex, and a second surfacethereof may be concave. In addition, the sixth lens 60 may haveinflection points formed on the first and second surfaces thereof,respectively. The seventh lens 70 may have negative refractive power. Afirst surface of the seventh lens 70 may be convex, and a second surfacethereof may be concave. Further, the seventh lens 70 may have aninflection point formed on the second surface thereof.

The exemplary embodiment of the lens module configured as describedabove may have MTF characteristics and aberration characteristics asshown in FIGS. 8 and 9 , respectively.

TABLE 5 Radius of Tickness/ Refractive: Abbe Example 3 CurvatureDistance index number Object Infinity Infinity ST Infinity 0.050 1 1.8020.540 1.544 56.1 2 13.001 0.104 3 4.169 0.242 1.635 24.0 4 2.233 0.301 56.476 0.398 1.544 56.1 6 −4.982 0.347 7 −1.252 0.240 1.635 24.0 8 −1.8950.164 9 −1.547 0.242 1.544 56.1 10 −1.551 0.100 11 2.535 0.554 1.63524.0 12 2.455 0.281 13 2.075 0.537 1.544 56.1 14 1.514 0.252 15 Infinity0.300 1.517 64.2 16 Infinity 0.600 image

TABLE 6 Example 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Y Radius 1.802 13.0014.169 2.233 6.476 −4.982 −1.252 −1.895 −1.547 −1.551 2.535 2.455 2.0751.514 Conic Constant 0.000 0.000 0.000 −7.719 0.000 0.000 −2.215 −0.6190.052 −0.350 0.000 0.000 −15.289 −8.510 (K) 4th-order −0.014 −0.145−0.258 −0.120 −0.101 −0.047 −0.027 −0.023 0.051 0.048 −0.092 −0.107−0.134 −0.089 Coefficient (A) 6th-order −0.001 0.239 0.524 0.331 0.012−0.016 0.020 0.032 0.014 0.017 −0.008 0.017 0.022 0.023 Coefficient (B)8th-order −0.064 −0.383 −0.639 −0.348 −0.023 0.012 −0.019 −0.011 0.0040.003 0.015 −0.004 0.007 −0.003 Coefficient (C) 10th-order 0.073 0.2860.477 0.220 0.022 −0.019 0.010 −0.002 0.003 −0.004 −0.010 0.000 −0.0030.000 Coefficient (D) 12th-order −0.069 −0.119 −0.170 −0.046 −0.0200.024 −0.002 0.004 0.001 0.001 0.002 0.000 0.000 0.000 Coefficient (E)14th-order 0.009 0.015 0.021 0.000 0.022 −0.009 −0.002 0.001 0.000 0.0000.000 0.000 0.000 0.000 Coefficient (F) 16th-order Coefficient (G)18th-order Coefficient (H) 20th-order Coefficient (J)

The lens module according to the fourth exemplary embodiment (Example 4)of the present disclosure will be described with reference to FIGS. 10through 12 .

The lens module 100 according to this exemplary embodiment may include afirst lens 10, a second lens 20, a third lens 30, a fourth lens 40, afifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module100 may further include an infrared cut-off filter 80 and an imagesensor 90. Further, the lens module 100 may further include at least oneaperture stop (not shown). The aperture stop (not shown) may be arrangedin front of the first lens 10 or anywhere between the first lens 10 andthe seventh lens 70. For reference, an overall focal length f of thelens module 100 may be 4.300 [mm], a focal length of the first lens 10may be 5.204, a focal length of the second lens 20 may be 1000.000, afocal length of the third lens 30 may be 4.026, a focal length of thefourth lens 40 may be −4.520, a focal length of the fifth lens 50 may be7.456, a focal length of the sixth lens 60 may be −31.268, and a focallength of the seventh lens 70 may be −5.024.

Table 7 below shows radii of curvature of the lenses, thicknesses of thelenses or distances between the lenses, refractive indices of thelenses, and abbe numbers of the lenses. Table 8 below indicates anaspheric constant of each of the lenses.

In this exemplary embodiment, the first lens 10 may have positiverefractive power. A first surface of the first lens 10 may be convex,and a second surface thereof may be concave. The second lens 20 may havepositive refractive power. A first surface of the second lens 20 may beconvex, and a second surface thereof may be concave. The third lens 30may have positive refractive power. Both surfaces of the third lens 30may be convex. The fourth lens 40 may have negative refractive power. Afirst surface of the fourth lens 40 may be concave, and a second surfacethereof may be convex. That is, the fourth lens 40 may have a meniscusshape in which it is convex toward an image side. The fifth lens 50 mayhave positive refractive power. A first surface of the fifth lens 50 maybe concave, and a second surface thereof may be convex. That is, thefifth lens 50 may have a meniscus shape in which it is convex toward theimage side. The sixth lens 60 may have negative refractive power. Afirst surface of the sixth lens 60 may be convex, and a second surfacethereof may be concave. In addition, the sixth lens 60 may haveinflection points formed on the first and second surfaces thereof,respectively. The seventh lens 70 may have negative refractive power. Afirst surface of the seventh lens 70 may be concave, and a secondsurface thereof may be concave. Further, the seventh lens 70 may have aninflection point formed on the second surface thereof.

The exemplary embodiment of the lens module configured as describedabove may have MTF characteristics and aberration characteristics asshown in FIGS. 11 and 12 , respectively.

TABLE 7 Radius of Tickness/ Refractive Abbe Example 4 Curvature DistanceIndex number Object Infinity Infinity ST Infinity 0.050 1 1.946 0.4261.544 56.1 2 5.740 0.192 3 5.025 0.250 1.635 24.0 4 4.968 0.222 5 16.0210.471 1.544 56.1 6 −2.512 0.188 7 −1.396 0.570 1.635 24.0 8 −3.150 0.1749 −1.832 0.340 1.544 56.1 10 −1.344 0.100 11 3.272 0.576 1.635 24.0 122.617 0.590 13 −5.948 0.501 1.544 56.1 14 5.208 0.139 15 Infinity 0.3001.517 64.2 16 Infinity 0.489 Image

TABLE 8 Example 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Y Radius 1.946 5.7405.025 4.968 16.021 −2.512 −1.396 −3.150 −1.832 −1.344 3.272 2.617 −5.9485.208 Conic Constant 0.000 0.000 0.000 −45.000 0.000 0.000 −1.319 1.905−0.184 −0.759 0.000 0.000 −50.000 −50.000 (K) 4th-order −0.019 −0.190−0.327 −0.210 −0.126 −0.069 −0.047 −0.022 0.071 0.100 −0.106 −0.137−0.074 −0.045 Coefficient (A) 6th-order 0.040 0.287 0.485 0.269 0.002−0.037 0.034 0.046 0.011 0.002 0.013 0.033 0.001 0.015 Coefficient (B)8th-order −0.098 −0.403 −0.617 −0.347 −0.070 0.004 −0.014 −0.010 −0.0010.006 0.006 −0.005 0.007 −0.003 Coefficient (C) 10th-order 0.071 0.2880.461 0.230 0.000 −0.022 0.010 −0.002 0.001 −0.003 −0.004 0.000 −0.0020.000 Coefficient (D) 12th-order −0.005 −0.118 −0.165 −0.058 −0.0120.022 0.001 0.003 0.000 0.000 0.000 0.000 0.000 0.000 Coefficient (E)14th-order −0.040 0.004 0.015 0.000 0.023 −0.009 −0.004 0.000 0.0000.000 0.000 0.000 0.000 0.000 Coefficient (F) 16th-order Coefficient (G)18th-order Coefficient (H) 20th-order Coefficient (J)

The lens module according to the fifth exemplary embodiment (Example 5)of the present disclosure will be described with reference to FIGS. 13through 15 .

The lens module 100 according to this exemplary embodiment may include afirst lens 10, a second lens 20, a third lens 30, a fourth lens 40, afifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module100 may further include an infrared cut-off filter 80 and an imagesensor 90. Further, the lens module 100 may further include at least oneaperture stop (not shown). The aperture stop (not shown) may be arrangedin front of the first lens 10 or anywhere between the first lens 10 andthe seventh lens 70. For reference, an overall focal length f of thelens module 100 may be 4.522 [mm], a focal length of the first lens 10may be 4.584, a focal length of the second lens 20 may be −8.221, afocal length of the third lens 30 may be 6.410, a focal length of thefourth lens 40 may be 73.896, a focal length of the fifth lens 50 may be17.417, a focal length of the sixth lens 60 may be −12.539, and a focallength of the seventh lens 70 may be −6.829.

Table 9 below shows radii of curvature of the lenses, thicknesses of thelenses or distances between the lenses, refractive indices of thelenses, and abbe numbers of the lenses. Table 10 below indicates anaspheric constant of each surface of the lenses.

In this exemplary embodiment, the first lens 10 may have positiverefractive power. A first surface of the first lens 10 may be convex,and a second surface thereof may be concave. The second lens 20 may havenegative refractive power. A first surface of the second lens 20 may beconvex, and a second surface thereof may be concave. The third lens 30may have positive refractive power. Both surfaces of the third lens 30may be convex. The fourth lens 40 may have positive refractive power. Afirst surface of the fourth lens 40 may be concave, and a second surfacethereof may be convex. That is, the fourth lens 40 may have a meniscusshape in which it is convex toward an image side. The fifth lens 50 mayhave positive refractive power. A first surface of the fifth lens 50 maybe concave, and a second surface thereof may be convex. That is, thefifth lens 50 may have a meniscus shape in which it is convex toward theimage side. The sixth lens 60 may have negative refractive power. Afirst surface of the sixth lens 60 may be convex, and a second surfacethereof may be concave. In addition, the sixth lens 60 may haveinflection points formed on the first and second surfaces thereof,respectively. The seventh lens 70 may have negative refractive power. Afirst surface of the seventh lens 70 may be convex, and a second surfacethereof may be concave. Further, the seventh lens 70 may have aninflection point formed on the second surface thereof.

The exemplary embodiment of the lens module configured as describedabove may have MTF characteristics and aberration characteristics asshown in FIGS. 14 and 15 , respectively.

TABLE 9 Radius of Tickness/ Refractive Abbe Example 5 Curvature DistanceIndex number Object Infinity Infinity ST Infinity 0.050 1 2.004 0.4401.544 56.1 2 9.413 0.102 3 5.035 0.220 1.635 24.0 4 2.520 0.305 5 4.2720.481 1.544 56.1 2 −18.245 0.322 7 −2.964 0.262 1.635 24.0 8 −2.8830.125 9 −2.348 0.329 1.544 56.1 10 −1.975 0.150 11 5.085 0.581 1.63524.0 12 2.965 0.516 13 2.794 0.500 1.544 56.1 14 1.494 0.317 15 Infinity0.300 1.517 64.2 16 Infinity 0.503 Image

TABLE 10 Example 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Y Radius 2.004 9.4135.035 2.520 4.272 −18.245 −2.964 −2.883 −2.348 −1.975 5.085 2.965 2.7941.494 Conic Constant 0.000 0.000 0.000 −10.034 0.000 0.000 −2.420 −0.9920.398 −0.449 0.000 0.000 −21.513 −6.544 (K) 4th-order −0.016 −0.141−0.255 −0.120 −0.103 −0.068 −0.021 −0.018 0.067 0.041 −0.103 −0.118−0.141 −0.087 Coefficient (A) 6th-order 0.007 0.245 0.526 0.324 0.006−0.026 0.032 0.029 0.007 0.024 0.004 0.028 0.025 0.026 Coefficient (B)8th-order −0.063 −0.369 −0.643 −0.354 −0.028 0.011 −0.016 −0.011 −0.0020.005 0.016 −0.003 0.004 −0.005 Coefficient (C) 10th-order 0.073 0.2860.474 0.220 0.022 −0.018 0.011 −0.001 0.001 −0.005 −0.011 0.000 −0.0010.000 Coefficient (D) 12th-order −0.063 −0.125 −0.171 −0.049 −0.0200.023 0.001 0.002 −0.001 0.000 0.002 0.000 0.000 0.000 Coefficient (E)14th-order 0.012 0.018 0.021 0.000 0.015 −0.009 −0.001 0.000 0.000 0.0000.000 0.000 0.000 0.000 Coefficient (F) 16th-order Coefficient (G)18th-order Coefficient (H) 20th-order Coefficient (J)

The lens module according to the sixth exemplary embodiment (Example 6)of the present disclosure will be described with reference to FIGS. 16through 18 .

The lens module 100 according to this exemplary embodiment may include afirst lens 10, a second lens 20, a third lens 30, a fourth lens 40, afifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module100 may further include an infrared cut-off filter 80 and an imagesensor 90. Further, the lens module 100 may further include at least oneaperture stop (not shown). The aperture stop (not shown) may be arrangedin front of the first lens 10 or anywhere between the first lens 10 andthe seventh lens 70. For reference, an overall focal length f of thelens module 100 may be 4.165 [mm], a focal length of the first lens 10may be 3.794, a focal length of the second lens 20 may be −8.619, afocal length of the third lens 30 may be −341.847, a focal length of thefourth lens 40 may be 96.237, a focal length of the fifth lens 50 may be3.198, a focal length of the sixth lens 60 may be −11.131, and a focallength of the seventh lens 70 may be −4.635.

Table 11 below shows radii of curvature of the lenses, thicknesses ofthe lenses or distances between the lenses, refractive indices of thelenses, and abbe numbers of the lenses. Table 12 below indicates anaspheric constant of each surface of the lenses.

In this exemplary embodiment, the first lens 10 may have positiverefractive power. Both surfaces of the first lens 10 may be convex. Thesecond lens 20 may have negative refractive power. Both surfaces of thesecond lens 20 may be concave. The third lens 30 may have negativerefractive power. A first surface of the third lens 30 may be convex,and a second surface thereof may be concave. The fourth lens 40 may havepositive refractive power. A first surface of the fourth lens 40 may beconvex, and a second surface thereof may be concave. The fifth lens 50may have positive refractive power. A first surface of the fifth lens 50may be concave, and a second surface thereof may be convex. That is, thefifth lens 50 may have a meniscus shape in which it is convex toward theimage side. The sixth lens 60 may have negative refractive power. Afirst surface of the sixth lens 60 may be concave, and a second surfacethereof may be convex. The seventh lens 70 may have negative refractivepower. A first surface of the seventh lens 70 may be convex, and asecond surface thereof may be concave. Further, the seventh lens 70 mayhave an inflection point formed on the second surface thereof.

The exemplary embodiment of the lens module configured as describedabove may have MTF characteristics and aberration characteristics asshown in FIGS. 17 and 18 , respectively.

TABLE 11 Radius of Tickness/ Refractive: Abbe Example 6 CurvatureDistance Index number object Infinity Infinity ST Infinity 0.050 1 2.1430.439 1.544 56.1 2 −51.915 0.111 3 −52.701 0.224 1.635 24.0 4 6.1170.345 5 4.745 0.289 1.544 56.1 6 4.527 0.196 7 6.434 0.310 1.635 24.0 87.057 0.252 9 −4.163 0.578 1.544 56.1 10 −1.287 0.194 11 −1.732 0.3001.635 24.0 12 −2.448 0.221 13 2.768 0.664 1.544 56.1 14 1.208 0.489 15Infinity 0.300 1.517 64.2 16 Infinity 0.515 Image

TABLE 12 Example 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Y Radius 2.143−51.915 −52.701 6.117 4.745 4.527 6.434 7.057 −4.163 −1.287 −1.732−2.448 2.768 1.208 Conic Constant 0.000 0.000 0.000 −75.000 0.000 0.000−50.000 25.000 7.020 −0.330 0.000 0.000 −24.215 −4.495 (K) 4th-order−0.020 −0.129 −0.233 −0.146 −0.123 −0.105 −0.141 −0.121 0.037 0.0590.042 0.016 −0.074 −0.052 Coefficient (A) 6th-order 0.017 0.221 0.5160.312 0.017 −0.004 0.014 0.000 −0.029 0.012 −0.002 0.006 0.004 0.013Coefficient (B) 8th-order −0.078 −0.288 −0.621 −0.376 −0.031 −0.006−0.027 −0.008 −0.002 −0.001 0.017 0.000 0.005 −0.002 Coefficient (C)10th-order 0.085 0.250 0.417 0.197 0.007 −0.028 0.004 −0.001 0.002 0.000−0.009 0.001 −0.001 0.000 Coefficient (D) 12th-order −0.043 −0.205−0.200 −0.047 −0.019 0.017 0.000 0.002 0.003 0.003 0.002 0.000 0.0000.000 Coefficient (E) 14th-order −0.019 0.064 0.049 0.000 0.009 −0.007−0.002 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Coefficient (F)16th-order Coefficient (G) 18th-order Coefficient (H) 20th-orderCoefficient (J)

The lens module according to the seventh exemplary embodiment (Example7) of the present disclosure will be described with reference to FIGS.19 through 21 .

The lens module 100 according to this exemplary embodiment may include afirst lens 10, a second lens 20, a third lens 30, a fourth lens 40, afifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module100 may further include an infrared cut-off filter 80 and an imagesensor 90. Further, the lens module 100 may further include at least oneaperture stop (not shown). The aperture stop (not shown) may be arrangedin front of the first lens 10 or anywhere between the first lens 10 andthe seventh lens 70. For reference, an overall focal length f of thelens module 100 may be 4.000 [mm], a focal length of the first lens 10may be 3.907, a focal length of the second lens 20 may be −9.478, afocal length of the third lens 30 may be −415.933, a focal length of thefourth lens 40 may be 986.711, a focal length of the fifth lens 50 maybe 3.042, a focal length of the sixth lens 60 may be −10.825, and afocal length of the seventh lens 70 may be −4.979.

Table 13 below shows radii of curvature of the lenses, thicknesses ofthe lenses or distances between the lenses, refractive indices of thelenses, and abbe numbers of the lenses. Table 14 below indicates anaspheric constant of each surface of the lenses.

In this exemplary embodiment, the first lens 10 may have positiverefractive power. Both surfaces of the first lens 10 may be convex. Thesecond lens 20 may have negative refractive power. Both surfaces of thesecond lens 20 may be concave. The third lens 30 may have negativerefractive power. A first surface of the third lens 30 may be convex,and a second surface thereof may be concave. The fourth lens 40 may havepositive refractive power. A first surface of the fourth lens 40 may beconvex, and a second surface thereof may be concave. The fifth lens 50may have positive refractive power. A first surface of the fifth lens 50may be concave, and a second surface thereof may be convex. That is, thefifth lens 50 may have a meniscus shape in which it is convex toward theimage side. The sixth lens 60 may have negative refractive power. Afirst surface of the sixth lens 60 may be concave, and a second surfacethereof may be convex. The seventh lens 70 may have negative refractivepower. A first surface of the seventh lens 70 may be convex, and asecond surface thereof may be concave. Further, the seventh lens 70 mayhave an inflection point formed on the second surface thereof.

The exemplary embodiment of the lens module configured as describedabove may have MTF characteristics and aberration characteristics asshown in FIGS. 20 and 21 , respectively.

TABLE 13 Radius of Tickness/ Refractive Abbe Example 7 CurvatureDistance Index number Object Infinity Infinity ST Infinity 0.05 1 2.1580.415 1.544 56.1 2 −135.165 0.100 3 −252.549 0.220 1.635 24.0 4 6.1670.372 5 5.119 0.298 1.544 56.1 6 4.903 0.165 7 7.230 0.313 1.635 24.0 87.191 0.238 9 −4.289 0.634 1.544 56.1 10 −1.256 0.100 11 −1.725 0.2211.635 24.0 12 −2.419 0.221 13 2.586 0.744 1.544 56.1 14 1.189 0.527 15Infinity 0.300 1.517 64.2 16 Infinity 0.515 Image

TABLE 14 Example 2 3 4 5 6 7 8 Y Radius 2.158 −135.165 −252.549 6.1675.119 4.903 7.230 Conic Constant 0.000 0.000 0.000 −75.000 0.000 0.000−50.000 (K) 4th-order −0.019 −0.129 −0.226 −0.138 −0.130 −0.118 −0.150Coefficient (A) 6th-order 0.015 0.224 0.511 0.303 0.024 0.007 0.017Coefficient (B) 8th-order −0.079 −0.295 −0.628 −0.377 −0.037 −0.008−0.024 Coefficient (C) 10th-order 0.089 0.233 0.415 0.199 0.003 −0.0310.005 Coefficient (D) 12th-order −0.050 −0.206 −0.204 −0.046 −0.0230.016 −0.001 Coefficient (E) 14th-order −0.023 0.073 0.062 0.000 0.009−0.008 −0.003 Coefficient (F) 16th-order Coefficient (G) 18th-orderCoefficient (H) 20th-order Coefficient (J) Example 9 10 11 12 13 14 15 YRadius 7.191 −4.289 −1.256 −1.725 −2.419 2.586 1.189 Conic Constant25.000 7.250 −0.377 0.000 0.000 −18.411 −4.222 (K) 4th-order −0.1190.040 0.055 0.049 0.017 −0.074 −0.050 Coefficient (A) 6th-order 0.002−0.032 0.014 −0.005 0.007 0.005 0.012 Coefficient (B) 8th-order −0.008−0.001 −0.003 0.017 0.000 0.004 −0.002 Coefficient (C) 10th-order 0.0000.001 −0.001 −0.009 0.001 −0.001 0.000 Coefficient (D) 12th-order 0.0020.002 0.003 0.002 0.000 0.000 0.000 Coefficient (E) 14th-order 0.0000.000 0.000 0.000 0.000 0.000 0.000 Coefficient (F) 16th-orderCoefficient (G) 18th-order Coefficient (H) 20th-order Coefficient (J)

The lens modules according to first to seventh exemplary embodiments ofthe present disclosure configured as described above may satisfyConditional Expression 1 to 8 as shown in Table 15 below and improveoptical performance of the lenses.

TABLE 15 Example Example Example Example Example Example Example RemarkConditional Expression 1 2 3 4 5 6 7 1 1.0 < f12/f < 2.0 1.455 1.3181.405 1.181 1.906 1.472 1.526 2 TTL/f < 1.40 1.211 1.223 1.229 1.2791.216 1.318 1.362 3 BFL/f > 0.2 0.272 0.239 0.270 0.218 0.247 0.3170.339 4 R1/f > 0.35 0.409 0.409 0.422 0.452 0.443 0.515 0.539 5 −0.6 <(R11 − R12)/(R11 + R12) < 8.0 −0.044 0.030 0.016 0.112 0.263 −0.171−1.173 6 −2.0 < R13/f < 1.0 0.517 0.704 0.486 −1.383 0.618 0.665 0.647 7−10.0 < (R5 − R6)/(R5 + R6) < 14.0 5.868 5.966 7.673 1.372 −1.611 0.0230.022 8 ANG/f > 15.0 16.101 15.258 16.438 17.715 16.264 18.647 20.350

As set forth above, according to exemplary embodiments of the presentdisclosure, aberration may be easily corrected and high resolution maybe implemented.

While exemplary embodiments have been shown and described above, it willbe apparent to those skilled in the art that modifications andvariations could be made without departing from the spirit and scope ofthe present disclosure as defined by the appended claims. Theillustrative discussions above are not intended to be exhaustive or tolimit the invention to the precise forms disclosed.

What is claimed is:
 1. A lens module comprising: a first lens having aconcave image-side surface; a second lens having a refractive power; athird lens having a convex object-side surface; a fourth lens havingnegative refractive power; a fifth lens having a concave object-sidesurface; a sixth lens having a refractive power; and a seventh lenshaving a refractive power, wherein the first to seventh lenses aresequentially disposed from an object side toward an image plane, andwherein a radius of curvature of an image-side surface of the secondlens is greater than a radius of curvature of an object-side surface ofthe fourth lens.
 2. The lens module of claim 1, wherein the first lenshas a convex object-side surface.
 3. The lens module of claim 1, whereinthe second lens has a convex object-side surface.
 4. The lens module ofclaim 1, wherein the second lens has a concave image-side surface. 5.The lens module of claim 1, wherein the sixth lens has a convexobject-side surface.
 6. The lens module of claim 1, wherein the sixthlens has a concave image-side surface.
 7. The lens module of claim 1,wherein the seventh lens has a concave image-side surface.
 8. A lensmodule comprising: a first lens having a refractive power; a second lenshaving negative refractive power; a third lens having a convexobject-side surface; a fourth lens having a refractive power; a fifthlens having a refractive power; a sixth lens having positive refractivepower and a concave image-side surface; and a seventh lens having arefractive power, wherein the first to seventh lenses are sequentiallydisposed from an object side toward an image plane, and wherein a radiusof curvature of an object-side surface of the second lens is greaterthan a radius of curvature of an image-side surface of the sixth lens.9. The lens module of claim 8, wherein the first lens has a convexobject-side surface.
 10. The lens module of claim 8, wherein the firstlens has a concave image-side surface.
 11. The lens module of claim 8,wherein the second lens has a convex object-side surface.
 12. The lensmodule of claim 8, wherein the second lens has a concave image-sidesurface.
 13. The lens module of claim 8, wherein the fourth lens has aconvex image-side surface.
 14. The lens module of claim 8, wherein thesixth lens has a convex object-side surface.
 15. The lens module ofclaim 8, wherein the seventh lens has a concave image-side surface.